call.RemoteEndpointProperties.AllowTransfer return false

AppCallController is a UCMA application,

AppCallTester is another UCMA application,

AppCallTester initiates a call to AppCallController, when the call is accepted, AppCallController self-transfers the accepted call ,

but the transfer failed because AppCallTester does not support transfer ( RemoteEndpointProperties.AllowTransfer return false).

Is it possible to make AppCallTester support transfer?

Thanks for your help.